The swallows, martins, and saw-wings, or Hirundinidae are a family of passerine songbirds found around the world on all continents, including occasionally in Antarctica. Highly adapted to aerial feeding, they have a distinctive appearance. Feeding on aerial plankton that is constantly varying with the vagaries of the weather, their lifestyle is in many ways more like that of a storm-petrel than a typical passerine.

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